JPH01230921A - Smoke discharging desulfurization fan control method in fcb operation - Google Patents

Smoke discharging desulfurization fan control method in fcb operation

Info

Publication number
JPH01230921A
JPH01230921A JP5394888A JP5394888A JPH01230921A JP H01230921 A JPH01230921 A JP H01230921A JP 5394888 A JP5394888 A JP 5394888A JP 5394888 A JP5394888 A JP 5394888A JP H01230921 A JPH01230921 A JP H01230921A
Authority
JP
Japan
Prior art keywords
fcb
signal
fan
function generator
inlet damper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP5394888A
Other languages
Japanese (ja)
Other versions
JPH0752012B2 (en
Inventor
Ichiro Tashiro
田代 一郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHI Corp
Original Assignee
IHI Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IHI Corp filed Critical IHI Corp
Priority to JP5394888A priority Critical patent/JPH0752012B2/en
Publication of JPH01230921A publication Critical patent/JPH01230921A/en
Publication of JPH0752012B2 publication Critical patent/JPH0752012B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

PURPOSE:To prevent an extreme draft within a discharging gas duct from being decreased and assure the safety of a boiler and an electrical dust collector and the like by a method wherein a minus biasing signal is fed in advance to an air flow rate instruction for use in controlling a fan inlet damper by an FCB signal when an FCB operation is carried out and the fan inlet damper is metered at full speed. CONSTITUTION:When an FCB is generated, a function generator 25 may produce an FCB signal in response to a load instruction 1 and this is inputted to a function generator 27 through a switching unit 26. Then, a minus biasing signal is issued from the function generator 27 and its signal is added to an adder 29 through a limiter 23 for a rate of variation. With this arrangement, since a proceeding biasing signal is rapidly fed in advance to a fan inlet damper 15 controlled through a function generator 16 with an air flow rate instruction 5, the fan inlet damper 15 is metered at full speed. This state is held for a desired time by a variation rate limiter 28, and a biasing signal is extracted in compliance with a recovery of draft in timing, thus, it is possible to make draft stabilized.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、ボイラにおけるFCB (ファーストカット
バック−燃料急速絞り込み)動作時における排煙脱硫フ
ァンの制御方法に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for controlling an exhaust gas desulfurization fan during FCB (first cutback - rapid fuel throttling) operation in a boiler.

[従来の技術] 第2図は従来のボイラの一例を示すもので、負荷指令1
に基づく燃料指令2により燃料弁3を制御してボイラ4
に導入する重原油等の燃料流−を制御し、又、前記燃料
指令2に基づく空気流量指令5によりボイラ4に空気を
供給する押込通風機6を制御するようにしており、ボイ
ラ4にて燃焼して熱交換を行った排ガスは、排ガスダク
ト7により空気予熱器(図示せず)、電気集塵器8、脱
硫ファン9、及び脱硫装置10等を経て煙突11に導か
れるようになっている。
[Prior art] Figure 2 shows an example of a conventional boiler, in which load command 1
The fuel valve 3 is controlled by the fuel command 2 based on the boiler 4.
In addition, a forced draft fan 6 that supplies air to the boiler 4 is controlled in accordance with an air flow rate command 5 based on the fuel command 2. The exhaust gas that has undergone combustion and heat exchange is guided to the chimney 11 by the exhaust gas duct 7 via an air preheater (not shown), an electric precipitator 8, a desulfurization fan 9, a desulfurization device 10, etc. There is.

前記脱硫ファン9は流体継手24を介してモータ12に
より駆動されており、該モータ12は前記負荷指令1か
ら関数発生器13を介して求めたファン駆動信号14に
より作動される。又、前記脱硫ファン9の入口にファン
入口ダンパ15を設け、前記空気流量指令5を関数発生
器16及び加算器17を介して、前記ファン入口ダンパ
15に人力することにより、その開度制御を行うように
している。
The desulfurization fan 9 is driven by a motor 12 via a fluid coupling 24, and the motor 12 is operated by a fan drive signal 14 obtained from the load command 1 via a function generator 13. Further, a fan inlet damper 15 is provided at the inlet of the desulfurization fan 9, and the opening degree of the fan inlet damper 15 is controlled by manually inputting the air flow rate command 5 to the fan inlet damper 15 via a function generator 16 and an adder 17. I try to do it.

前記排ガスダクト7に前記脱硫ファン9をバイパスする
ように設けられたバイパスダクト18に、脱硫バイパス
ダンパ19が設けられ、該ダンパ19は、通常時はダク
ト18を閉じており、その入口と出口の圧力差を検出す
る差圧計20の検出値がある差圧を示したとき自動的に
ダクト18を開くようになっている。
A desulfurization bypass damper 19 is provided in a bypass duct 18 provided in the exhaust gas duct 7 so as to bypass the desulfurization fan 9, and the damper 19 normally closes the duct 18 and connects its inlet and outlet. The duct 18 is automatically opened when the detected value of the differential pressure gauge 20 that detects the pressure difference shows a certain differential pressure.

上記構成において、電気系統事故等によりFCB(燃料
急速絞り込み指令)が発せられると、その負荷指令1に
より燃料指令2及び空気流量指令5が急速に減少させら
れる。このとき、燃料指令2は、所内電力確保のため、
切換器21により低負荷状態(α%)側に切換えられる
ようになっている。
In the above configuration, when an FCB (rapid fuel throttling command) is issued due to an electrical system accident or the like, the fuel command 2 and the air flow command 5 are rapidly reduced by the load command 1. At this time, fuel command 2 is issued in order to secure power within the station.
A switch 21 allows switching to a low load state (α%).

FCB発生時には、燃料弁3による燃料流量、押込通風
機6による空気流量、脱硫ファン9によるυトガス吸引
量がすべて急速に絞り込まれるように作動されるが、脱
硫ファン9はそれを駆動するモータ12及び脱硫ファン
9のイナーシャにより制御遅れが生じ、このために排ガ
スダクト7を介して電気集困器8及びボイラ4等に急激
に大きな負圧状態が発生し、これにより、前記装置が内
側への強度が弱いことによって潰れ変形を生じる等の問
題が生じる。
When FCB occurs, the fuel flow rate by the fuel valve 3, the air flow rate by the forced draft fan 6, and the amount of gas suction by the desulfurization fan 9 are all operated to be rapidly reduced. A control delay occurs due to the inertia of the desulfurization fan 9, and this causes a sudden large negative pressure state to occur in the electric collector 8, boiler 4, etc. via the exhaust gas duct 7, and as a result, the device is forced to move inward. The weak strength causes problems such as crushing and deformation.

このため、前記差圧計20の信号が、例えば−20a+
mAqが入力された引算器22に入力され、前記差圧計
20にこの一20+nmAQ以上の差圧が発生したとき
、コントローラ23を介して加算器17に信号を導入す
ることにより、ファン入口ダンパ15に導入される信号
に加算して、ファン入口ダンパ15を急速に絞り込むよ
うにしている。
Therefore, the signal of the differential pressure gauge 20 is, for example, −20a+
mAq is input to the subtracter 22, and when a differential pressure of 120+nmAQ or more is generated in the differential pressure gauge 20, a signal is introduced to the adder 17 via the controller 23, so that the fan inlet damper 15 The fan inlet damper 15 is rapidly throttled.

[発明が解決しようとする課題] 。[Problem to be solved by the invention].

しかし、上記従来方式においても、FCB発生時に、差
圧計20の検出値により、引算器22及びコントローラ
23を介して信号を加算させるのみでは制御上の遅れが
大きく、前記大きな負圧の発生による種々の問題を生じ
ていた。
However, even in the conventional method described above, when a FCB occurs, simply adding a signal via the subtracter 22 and the controller 23 based on the detected value of the differential pressure gauge 20 causes a large control delay. This caused various problems.

本発明は、上記従来の問題点に着目してなしたもので、
FCB動作時に、脱硫ファンによって排ガスダクト系路
のドラフトが極端に低下するのを防止することを目的と
している。
The present invention was made by focusing on the above-mentioned conventional problems.
The purpose is to prevent the draft of the exhaust gas duct system from being excessively lowered by the desulfurization fan during FCB operation.

[課題を解決するための手段] 本発明は、上記技術的課題を解決しようとしたもので、
脱硫ファンの駆動か出力指令により制御され、又脱硫フ
ァンの入口ダンパが空気流量指令及び脱硫バイパスダン
パの入側と出側の差圧により制御された状態において、
FCB動作時、出力指令から得たFCB信号により、前
記ファン入口ダンパ制御用空気流量指令にマイナスバイ
アス信号を先行投入してファン入口ダンパを全速で絞り
、ドラフトの回復とタイミングを合わせて前記マイナス
バイアス信号を抜くことを特徴とするFCB動作時の排
煙脱硫ファン制御方法、に係るものである。
[Means for Solving the Problems] The present invention attempts to solve the above technical problems, and
In a state where the drive or output command of the desulfurization fan is controlled, and the inlet damper of the desulfurization fan is controlled by the air flow rate command and the differential pressure between the inlet and outlet sides of the desulfurization bypass damper,
During FCB operation, a negative bias signal is applied in advance to the air flow rate command for controlling the fan inlet damper based on the FCB signal obtained from the output command, the fan inlet damper is throttled at full speed, and the negative bias is adjusted in time with draft recovery. This invention relates to a method for controlling an exhaust gas desulfurization fan during FCB operation, which is characterized by removing the signal.

[作   用コ 従って、本発明では、FCB動作時、FCB信号により
、ファン入口ダンパ制御用空気流量指令にマイナスバイ
アス信号を先行投入してファン入口ダンパを全速で絞り
込むこと1ニーより、排ガスダクト内の極端なドラフト
の低下を防止し、又ドラフトが回復するとそれに合わせ
て前記マイナスバイアスを抜くことによりドラフトを安
定化させる。
[Function] Accordingly, in the present invention, when the FCB is in operation, a negative bias signal is applied in advance to the air flow rate command for controlling the fan inlet damper using the FCB signal to throttle the fan inlet damper at full speed. This prevents an extreme drop in the draft, and when the draft recovers, the negative bias is removed to stabilize the draft.

[実 施 例コ 以下本発明の実施例を図面を参照しつつ説明する。[Implementation example] Embodiments of the present invention will be described below with reference to the drawings.

第1図は本発明の方法を実施する装置の一例を示すもの
で、図中第2図と同一符号を付した部分は同一物を表わ
す。
FIG. 1 shows an example of an apparatus for carrying out the method of the present invention, and parts in the figure with the same reference numerals as in FIG. 2 represent the same parts.

図示するように、負荷指令1を関数発生器25に導いて
FCBの指令をキャッチし、該FCB信号を切換器26
、関数発生器27、変化率制限器28を介し、加算器2
9によって、前記関数発生器16に導入される空気流量
指令5に先行バイアス(マイナス)信号を加算する。
As shown in the figure, the load command 1 is guided to the function generator 25 to catch the FCB command, and the FCB signal is sent to the switch 26.
, function generator 27, change rate limiter 28, adder 2
9 adds a pre-bias (minus) signal to the air flow command 5 introduced into the function generator 16.

このとき、前記切換器26は、通常時はO%倍信号関数
発生器27に送っており、FCB発生時には直ちにその
FCB信号を関数発生器27に送るよう自動的に切換え
られるようになっている。
At this time, the switch 26 normally sends the 0% signal to the function generator 27, and when FCB occurs, it is automatically switched to immediately send the FCB signal to the function generator 27. .

又変化率制限器28は、関数発生器27によるマイナス
バイアス信号を急激に入れてその状態を所要時間ホール
ドした後、急激に抜くように制御する。
Further, the rate of change limiter 28 is controlled so that the negative bias signal from the function generator 27 is suddenly applied, this state is held for a required period of time, and then the negative bias signal is suddenly removed.

上記においてFCBが発生すると、負荷指令1に基つい
て関数発生器25がFCB信号を発し、これが切換器2
6を介して関数発生器27に入力されることにより、マ
イナスバイアス信号が発せられ、その信号が変化率制限
器28を介して加算器29により加算される。
When FCB occurs in the above, the function generator 25 issues an FCB signal based on the load command 1, which is transmitted to the switch 2.
6 to the function generator 27, a negative bias signal is generated, and the signal is added by the adder 29 via the rate of change limiter 28.

上記により、空気流量指令5により関数発生器1θを介
して制御されているファン人ロダンノく15に、先行バ
イアス(マイナス)信号が先行して急速に投入されるの
で、ファン入ロダンノ115は全速で絞り込まれる。前
記変化率制限器28によりこの状態を所要時間ホールド
し、ドラフトの回復とタイミングを合わせてバイアス信
号を抜くようにする。
As a result of the above, the advance bias (minus) signal is rapidly inputted in advance to the fan-powered Rodanno 15, which is controlled by the air flow rate command 5 via the function generator 1θ, so that the fan-input Rodanno 115 operates at full speed. Narrowed down. This state is held for a required period of time by the change rate limiter 28, and the bias signal is removed in synchronization with the recovery of the draft.

またこのとき、押込通風機θへの空気流量指令5を、F
CBが発生しても一定時間だけその流量をホールドした
後、流体継手24の減少とマツチするように指令を低下
させることにより、FCB時の急激な負圧の発生防止効
果を更に高めることができる。
Also, at this time, the air flow rate command 5 to the forced draft fan θ is set to F
Even if CB occurs, by holding the flow rate for a certain period of time and then lowering the command to match the decrease in the fluid coupling 24, the effect of preventing sudden negative pressure from occurring during FCB can be further enhanced. .

尚、本発明は上記実施例にのみ限定されるものではなく
、本発明の要旨を逸脱しない範囲内で種々変更を加え得
る。
Note that the present invention is not limited to the above-mentioned embodiments, and various changes may be made without departing from the gist of the present invention.

[発明の効果] 上記したように、本発明のFCB動作時の排煙脱硫ファ
ン制御方法によれば、FCB動作時、FCB信号により
、ファン人ロダンバ制御用空気流量指令にマイナスバイ
アス信号を先行投入してファン人ロダンバを全速で絞り
込むことにより、・排ガスダクト内の極端なドラフトの
低下を防止してボイラ、電気集塵器等の安全を確保する
ことができ、又ドラフトか回復するとそれに合わせて前
記マイナスバイアスを抜くことによりドラフトを安定化
させることかできる優れた効果を奏し得る。
[Effects of the Invention] As described above, according to the flue gas desulfurization fan control method during FCB operation of the present invention, when the FCB is operating, a negative bias signal is input in advance to the air flow rate command for controlling the fan loader by the FCB signal. By narrowing down the fan rodamba at full speed, it is possible to prevent an extreme drop in the draft in the exhaust gas duct and ensure the safety of the boiler, electrostatic precipitator, etc., and when the draft recovers, it is possible to By removing the negative bias, an excellent effect of stabilizing the draft can be achieved.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の方法を実施する装置の一例を示す説明
図、第2図は従来装置の説明図である。 ■は負荷指令、2は燃料指令、4はボイラ、5は空気流
量指令、6は押込通風機、9は脱硫ファン、12はモー
タ、15はファン人ロダンバ、【9は脱硫バイパスダン
パ、20は差圧計、24は流体継手、25は関数発生器
、26は切換器、27は関数発生器、28は変化率制限
器、29は加算器を示す。
FIG. 1 is an explanatory diagram showing an example of an apparatus for carrying out the method of the present invention, and FIG. 2 is an explanatory diagram of a conventional apparatus. ■ is the load command, 2 is the fuel command, 4 is the boiler, 5 is the air flow command, 6 is the forced draft fan, 9 is the desulfurization fan, 12 is the motor, 15 is the fan rodamba, [9 is the desulfurization bypass damper, 20 is 24 is a differential pressure gauge, 24 is a fluid coupling, 25 is a function generator, 26 is a switch, 27 is a function generator, 28 is a rate of change limiter, and 29 is an adder.

Claims (1)

【特許請求の範囲】[Claims] 1)脱硫ファンの駆動が出力指令により制御され、又脱
硫ファンの入口ダンパが空気流量指令及び脱硫バイパス
ダンパの入側と出側の差圧により制御された状態におい
て、FCB動作時、出力指令から得たFCB信号により
、前記ファン入口ダンパ制御用空気流量指令にマイナス
バイアス信号を先行投入してファン入口ダンパを全速で
絞り、ドラフトの回復とタイミングを合わせて前記マイ
ナスバイアス信号を抜くことを特徴とするFCB動作時
の排煙脱硫ファン制御方法。
1) When the drive of the desulfurization fan is controlled by the output command and the inlet damper of the desulfurization fan is controlled by the air flow rate command and the differential pressure between the inlet and outlet sides of the desulfurization bypass damper, when the FCB operates, the output command Based on the obtained FCB signal, a negative bias signal is applied in advance to the air flow rate command for controlling the fan inlet damper, the fan inlet damper is throttled at full speed, and the negative bias signal is removed in synchronization with the draft recovery. A method of controlling an exhaust gas desulfurization fan during FCB operation.
JP5394888A 1988-03-08 1988-03-08 Flue gas desulfurization fan control method during FCB operation Expired - Lifetime JPH0752012B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5394888A JPH0752012B2 (en) 1988-03-08 1988-03-08 Flue gas desulfurization fan control method during FCB operation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5394888A JPH0752012B2 (en) 1988-03-08 1988-03-08 Flue gas desulfurization fan control method during FCB operation

Publications (2)

Publication Number Publication Date
JPH01230921A true JPH01230921A (en) 1989-09-14
JPH0752012B2 JPH0752012B2 (en) 1995-06-05

Family

ID=12956943

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5394888A Expired - Lifetime JPH0752012B2 (en) 1988-03-08 1988-03-08 Flue gas desulfurization fan control method during FCB operation

Country Status (1)

Country Link
JP (1) JPH0752012B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104141965A (en) * 2014-07-15 2014-11-12 国家电网公司 Desulfurization unit boiler flue implosion-proof optimal control system and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104141965A (en) * 2014-07-15 2014-11-12 国家电网公司 Desulfurization unit boiler flue implosion-proof optimal control system and method

Also Published As

Publication number Publication date
JPH0752012B2 (en) 1995-06-05

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